Improvement in valves



T. P. ROWLAND.

Valve.

Np. 196,311. Patented Oct.23,1877.

N. PETERS, PHOTOLI'I'MJGRAFNERI WQSHINGTON D C.

UNITED STATES ATENT DFFIGE. I

THOMAS F. ROWLAND, OF NEW YORK, N. Y.

[M PROVEMENT IN VALVES.

Specification forming part of Letters Patent No. 196,311, dated October 23, 1877; application filed May 25, 1877.

To all whom it may concern:

Be it known that I, THOMAS F. ROWLAND,

of the city, county, and State of New York,

have invented a new and useful Improvement in Valves, of which the following is a specification:

It has been found very dilficult in the manufacture of gas, especially that known as water-gas, to make suitable valves for containing the same, for the reason that the valves in ordinary use, made of iron or similar substances, are very readily destroyed by the rapidly-flowing currents of gas.

I have discovered that a valve may be used for this purpose made of soap-stone, which valve will remain tight for a great length of time.

It is found that a valve made of this material will successfully resist the rapidly-flowing currents of highly -heated gas and air, which are produced more especially in the manufacture of water-gas, and that no other substance, so far as I am aware, can produce this result.

Experiments have been tried with all the known substances, but it has been found impossible to keep the valves tight, probably because the rapidly-impinging particles of heated gas or steam will cut or .wear more readily intoahard than into a soft material, although I am not fully aware of the natural law which governs this subject.

In my figure, A represents the valve, B the seat, both made of soap-stone, although eitherthe valve or the seat might be made of a different material without materially altering my invention, which consists in the use of soapstone for one or both surfaces. This valve is a puppet-valve, but other forms may be used.

What I claim as my invention, and desire to secure by Letters Patent, is- I 1. As a new article of manufacture, a soapstone valve, substantially as described.

2. As a new article of manufacture, a soapstone valve-seat, substantially as described.

3. The combination of a soap-stone valve and soap-stone valve-seat, substa tially as described.

THOS. F. ROVVL'AND. Witnesses:

GEO. H. EVANS, WM. J. SAWYER 

